Amorphous, high glass transition temperature copolyester compositions, methods of manufacture, and articles thereof

ABSTRACT

An amorphous copolyester comprising the reaction product of: (a) a monomer of formula I 
                         
wherein R 1 , R 2 , R 3 , and R 5  are each independently hydrogen or a C 1-3  alkyl group, a is 0-1, b is 0-4, c is 0-4 and d is 0-3, and each R 4  is independently hydrogen or a C 1-3  alkyl group; (b) a virgin monomer selected from terephthalic acid, a di(C 1-3  alkyl) terephthalate, and combinations thereof, and (c) 1,4-cyclohexane dimethanol;
 
wherein the residue of monomer (a) is present in an amount from 7 to less than 12 mole % of the copolyester based on moles of repeat units in the polyester; and the copolyester has a glass transition temperature of at least 107° C., an intrinsic viscosity of at least 0.7 dl/g, and a molded sample has a Notched Izod value of at least 290 J/m determined in accordance with ASTM D256.

BACKGROUND

This disclosure relates to amorphous, high glass transition temperature copolyester compositions, methods of manufacture, and articles thereof.

Thermoplastic polyesters are readily molded into useful articles, and articles comprising such polyesters have valuable characteristics, including strength, toughness, high gloss, and solvent resistance. Polyesters therefore have utility in a wide range of applications, including automotive parts, electric appliances, and electronic devices.

Although polyesters can have a range of desirable performance properties, most of the commercially available amorphous polyesters, such as polyethylene terephthalate (PET), glycol-modified polyethylene terephthalate (PETG), and glycol-modified polycyclohexylenedimethylene terephthalate (PCTG), have useful impact properties, but low glass transition temperatures. This can significantly limit the range of applications for the polyesters. There accordingly remains a need in the marketplace for a new class of amorphous polyesters with better heat performance than those currently available.

BRIEF SUMMARY OF THE INVENTION

An amorphous copolyester is disclosed, comprising the reaction product of:

-   -   (a) a monomer of formula I

wherein R¹, R², R³, and R⁵ are each independently a C₁₋₃ alkyl group, a is 0-1, b is 0-4, c is 0-4 and d is 0-3, and each R⁴ is independently a hydrogen or a C₁₋₃ alkyl group;

-   -   (b) a virgin monomer selected from terephthalic acid, a di(C₁₋₃         alkyl) terephthalate, and combinations thereof, and     -   (c) 1,4-cyclohexane dimethanol;         wherein

the residue of monomer (a) is present in an amount from 7 to less than 12 mole % of the copolyester based on the total moles of repeat units in the polyester; and

the copolyester has a glass transition temperature of at least 107° C., an intrinsic viscosity of at least 0.7 dl/g, and a molded sample has a Notched Izod value of at least 290 J/m determined in accordance with ASTM D256 at 25° C.

In another embodiment, the method for the manufacture of the copolyester composition is disclosed, which comprises polymerizing the components in the presence of an esterification catalyst.

Compositions comprising the amorphous polyester are also disclosed.

Further disclosed are articles comprising the copolyester composition. Methods of manufacturing an article comprise extruding, shaping, calendaring, molding, or injection molding the copolyester composition.

The described and other features are exemplified by the following detailed description.

DETAILED DESCRIPTION OF THE INVENTION

Our invention is based on the discovery that it is now possible to make an amorphous copolyester composition having a combination of high glass transition temperature, high strength, and good flow. These properties are achieved using a specific combination of monomer units, including a combination of 1-phenylindane dicarboxylic acid and a terephthalyl component, together with 1,4-cyclohexanedimethanol. In a particularly advantageous feature, the terephthalyl component is a virgin monomer selected from terephthalic acid, a di(C₁₋₃ alkyl) terephthalate, and combinations thereof.

The prefix “bio-”, “bio-based” or “bio-derived” as used herein means that the compound or composition is ultimately derived, in whole or in part, from a biological source, e.g., “bio-based terephthalic acid” is derived from a biological (e.g., plant or microbial source) rather than a petroleum source. Similarly, the prefix “petroleum-” or “petroleum-derived” means that the compound or composition is ultimately derived from a petroleum source, e.g., a “petroleum-derived poly(ethylene terephthalate) is derived from reactants that are themselves derived from petroleum. For example, U.S. patent application Ser. No. 12/347,423, filed Dec. 31, 2008 and published as US 2010/0168371 A1 on Jul. 1, 2010, describes bio-based polyesters produced from a biomass containing a terpene or terpenoid, such as limonene, as well as the process of making these products. The bio-based polyesters include poly(alkylene terephthalate)s such as bio-based poly(ethylene terephthalate) (bio-PET), bio-based poly(trimethylene terephthalate) (bio-PTT), bio-based poly(butylene terephthalate), bio-based poly(cyclohexylene terephthalate) (bio-PCT), bio-based poly(cyclohexylene terephthalate glycol) (bio-PCTG), bio-based (polyethylene terephthalate glycol) (bio-PETG).

As used herein the singular forms “a,” “an,” and “the” include plural referents. “Or” means “and/or.” The term “combination” is inclusive of blends, mixtures, alloys, reaction products, and the like. Unless defined otherwise, technical and scientific terms used herein have the same meaning as is commonly understood by one of skill. Compounds are described using standard nomenclature. The term “and a combination thereof” is inclusive of the named component and/or other components not specifically named that have essentially the same function.

Other than in the operating examples or where otherwise indicated, all numbers or expressions referring to quantities of ingredients, reaction conditions, and the like, used in the specification and claims are to be understood as modified in all instances by the term “about.” Various numerical ranges are disclosed in this patent application. Because these ranges are continuous, they include every value between the minimum and maximum values. The endpoints of all ranges reciting the same characteristic or component are independently combinable and inclusive of the recited endpoint. Unless expressly indicated otherwise, the various numerical ranges specified in this application are approximations. The term “from more than 0 to” an amount means that the named component is present in some amount that is greater than 0, and up to and including the higher named amount.

Polyesters are generally manufactured by polymerization of a dicarboxylic acid or reactive derivative thereof and a diol or reactive derivative thereof. The copolyesters herein are manufactured by polymerization of two dicarboxylic acids (a) a phenyl indane dicarboxylic acid or a reactive derivative thereof; and (b) a virgin terephthalic acid or reactive derivative thereof. The diol is 1,4-cyclohexanedimethanol or a reactive derivative thereof.

The 1-phenylindane dicarboxylic acid monomer is a monomer of formula I:

wherein R¹, R², R³, and R⁵ are each independently a C₁₋₃ alkyl group, a is 0-1, b is 0-4, c is 0-4 and d is 0-3, and each R⁴ is independently a hydrogen or a C₁₋₃ alkyl group. The acid or its C₁₋₃ alkyl ester can be used.

One skilled in the art will recognize this general class of monomers as the dicarboxylic acid derivatives of phenyl indane. Among these dicarboxylic acids are 3-(4-carboxyphenyl)-1,1,3-trimethyl-5-indan carboxylic acid; 3-(4-carboxyphenyl)-1,3-diethyl-1-methyl-5-indan carboxylic acid; 3-(4-carboxyphenyl)-1,3-dipropyl-1-methyl-5-indan carboxylic acid; and the like.

In a specific embodiment the monomers are of the formula II

wherein R¹, R², and R⁴ are each independently hydrogen or a C₁₋₃ alkyl group.

Monomers of formula III can be specifically mentioned

wherein R⁴ is each independently hydrogen or a C₁₋₃ alkyl group. In an embodiment, each R⁴ is the same and is a methyl or ethyl group, specifically a methyl group. This monomer is known in the literature, and when R⁴ is hydrogen, is also known as 1,3,3-trimethyl-1-phenylindan-4′,5-dicarboxylic acid; 1,1,3-trimethyl-5-carboxy-3-(p-carboxy-phenyl)indan; 1,1,3-trimethyl-5-carboxy-3-(4-carboxyphenyl)indan; and 3-(4-carboxyphenyl)-1,1,3-trimethyl-5-indan carboxylic acid. As described in U.S. Pat. No. 3,859,364, the diacid of monomer III is a commercially available material, generally referred to as phenylindan dicarboxylic acid, or, abbreviated, PIDA. The Preparation of PIDA have been disclosed by Petropoulous in, for example, U.S. Pat. Nos. 2,780,609; 2,830,966; and 2,873,262 and 3,102,135. Copolyesters of PIDA with terephthalic acid and ethylene glycol have been described in Belgian 731,258 and Netherlands 6905547. Alternatively, the monomer I, II, or III is a bio-based material, i.e., derived wholly or in part from a biological material, which excludes organic material that has been transformed by geological processes into petroleum, petrochemicals, and combinations thereof.

The terephthalate group is provided by copolymerization with terephthalic acid, a dialkyl terephthalate monomer, or a combination thereof, particularly a virgin di(C₁₋₃)alkyl ester of terephthalic acid, preferably the diethyl ester (DET) or dimethyl ester (DMT). The terephthalyl-containing polyester can contain virgin monomers, recycle monomers, including petroleum-based monomers and bio-based monomers. Thus, the terephthalyl component can be bio-based, i.e., derived in whole or in part from a biological material, which excludes organic material that has been transformed by geological processes into petroleum, petrochemicals, and combinations thereof.

In addition to the monomers I, II, or III and the terephthalyl component, the copolyester is manufactured from 1,4-cyclohexane dimethanol. In an embodiment, the 1,4-cyclohexane dimethanol has an isomer distribution of 60 to 80% trans and 20 to 40% cis isomers. In a specific embodiment, the amorphous copolyester comprises reacted 1,4-cyclohexane dimethanol in an amount of 50 mole %, based on the total moles of repeat units in the copolyester. The CHDM can be virgin monomer, derived from a polyester, or bio-based. For example, one skilled in the art will recognize that DMT or DET derived from a terephthalic-containing polyester homopolymer, terephthalic-containing copolymer, or a combination thereof can be further hydrogenated to 1,4-CHDM. In this instance, the resulting 1,4-CHDM will also contain 1,3-CHDM by-product generated by DMI hydrogenation. Accordingly, where 1,4-CHDM derived from recycle DMT or DET is used, the copolyester can further comprise units derived from 1,3-CHDM. For example, the copolyester can comprise from 0.01 to 5 mole %, from 0.01 to 1 mole %, or from 0.01 to 0.5 mole % of 1,3-cyclohexane dimethanol units, based on the total moles of repeat units in the copolyester.

Methods for the manufacture of the copolyesters from virgin terephthalic acid or di(C₁₋₃)alkyl terephthalic esters, 1-phenylindane monomers I, II, or III, in particular PIDA and 1,4-cyclohexane dimethanol are known and can be used. For example, the copolyesters can be obtained by melt-process condensation, or solution phase condensation in the presence of an acid catalyst. The catalyst facilitates the transesterification reaction, and can be selected from antimony compounds, tin compounds, titanium compounds, combinations thereof as well as many other metal catalysts and combinations of metal catalysts that have been disclosed in the literature. The amount of catalyst required to obtain an acceptable polymerization rate at the desired polymerization temperature will vary, and can be determined by experimentation. The catalyst amount can be 1 to 5000 ppm, or more. It is possible to prepare a branched polyester in which a branching agent, for example, a glycol having three or more hydroxyl groups or a trifunctional or multifunctional carboxylic acid has been incorporated. Furthermore, it is sometimes desirable to have various concentrations of acid and hydroxyl end groups on the polyester, depending on the ultimate end use of the composition.

In an advantageous feature, the copolyesters have an advantageous combination of properties, including an improved Tg, good intrinsic viscosity, and good impact strength.

The copolyesters manufactured from 1,4-cyclohexane dimethanol, 1-phenylindane I, II, or III, in particular PIDA and the virgin terephthalic acid/dialkyl terephthalate have a Tg of at least 107° C., specifically 107 to 117° C.

In general, the copolyester manufactured from 1,4-cyclohexane dimethanol, 1-phenylindane I, II, or III, in particular PIDA and the virgin terephthalic acid/dialkyl terephthalate will have an intrinsic viscosity of at least 0.7 deciliters per gram (dL/g), as measured in a 60:40 by weight phenol/1,1,2,2-tetrachloroethane mixture at 23° C.

The copolyester further has good impact strength, in particular, a molded sample has a Notched Izod value of at least 290 J/m, at least 400 J/m, or at least 600 J/m, determined in accordance with ASTM D256 at 25° C.

The copolyester can have a weight average molecular weight of 10,000 to 200,000 atomic mass units (amu), specifically 50,000 to 150,000 atomic mass units (amu) as measured by gel permeation chromatography (GPC) using polystyrene standards. The copolyester can also comprise a mixture of different batches of copolyester prepared under different process conditions in order to achieve different intrinsic viscosities and/or weight average molecular weights.

The copolyester can be clear or translucent. In an embodiment, the copolyesters are clear. For example, molded sample of the copolyester can have a haze less of less than 20%, less than 15%, less than 10%, less than 5%, or less than 3%, and a transmission greater than 70%, greater than 80%, greater than 85%, or greater than 90%, each measured according to ASTM D 1003-07 using illuminant C at a 0.062 inch (1.5 mm) thickness.

The copolyester can be used as a component in thermoplastic compositions for a variety of purposes. The copolyester can be present in the thermoplastic composition in an amount from 20 to 99.99 wt. %, or from 20 to 95 wt. %, or from 30 to 80 wt. % based on the total weight of the composition. Within this range, at least 50 wt. %, specifically at least 70 wt. %, of the copolyester can be present. In an embodiment, the polyester is present in an amount from 50 to 99 wt. %, based on the total weight of the thermoplastic composition, specifically from 60 to 98 wt. %, more specifically from 70 to 95 wt. %, each amount based on the total weight of the thermoplastic composition. The remaining components of the thermoplastic compositions can be other additives, including other polymers as further described below.

Such thermoplastic composition can optionally comprise other polyesters and/or other polymers, for example other polyesters or polycarbonates. As used herein, “polyesters” is inclusive of homopolymers and copolymers comprising ester units, and “polycarbonate” is inclusive of homopolymers and copolymers comprising carbonate units. Exemplary polyesters include poly(ethylene terephthalate) (“PET”), poly(1,4-butylene terephthalate), (“PBT”), poly(ethylene naphthalate) (“PEN”), poly(butylene naphthalate), (“PBN”), poly(1,3-propylene terephthalate) (“PPT”), poly(cyclohexane-1,4-dimethylene terephthalate) (“PCT”), poly(cyclohexane-1,4-dimethylene cyclohexane-1,4-dicarboxylate) also known as poly(l, 4-cyclohexane-dimethanol 1,4-dicarboxylate) (“PCCD”), and poly(cyclohexylene-1,4-dimethylene-co-ethylene terephthalate), also known as cyclohexanedimethanol-terephthalic acid-ethylene glycol (“PCTG” or “PETG”) copolymers. When the molar proportion of cyclohexanedimethanol is higher than that of ethylene glycol the polyester is termed PCTG. When the molar proportion of ethylene glycol is higher than that of cyclohexane dimethanol the polyester is termed PETG. As is known in the art, the foregoing polyesters can further comprise units derived from isophthalic acid. Combinations of the foregoing polymers can be used. The other polymer can be present in an amount of from more than 0.01 to 80 wt. %, or from 5 to 80 wt. %, or from 30 to 70 wt. %, each based on the total weight of the copolyester and the other polymers in the thermoplastic polyester composition. For example, a thermoplastic polyester composition comprising copolyester manufactured from combination of the monomer I, II, or III, virgin terephthalic acid or dialkyl terephthalate and the CHDM, can comprise from 1 to 30 wt. % percent, based on the total weight of the polyesters and other polymers in the thermoplastic polyester composition, of a second polyester, for example poly(ethylene terephthalate), poly(ethylene naphthalate), poly(1,4-butylene naphthalate), poly(trimethylene terephthalate), poly(1,4-cyclohexanedimethylene 1,4-cyclohexanedicarboxylate), poly(1,4-cyclohexanedimethylene terephthalate), poly(1,4-butylene-co-1,4-but-2-ene diol terephthalate), poly(1,4-cyclohexanedimethylene-co-ethylene terephthalate), or a combination comprising at least one of the foregoing polyesters. Alternatively, the thermoplastic polyester composition can comprise 1 to 50 wt. %, or 1 to 30 wt. %, or 1 to 10 wt. %, based on the total weight of the polyester and other polymers in the composition, of a polycarbonate and/or an aromatic copolyester carbonate. In a specific embodiment, the polymer component of the thermoplastic composition consists only of the copolyester. In another embodiment, the polymer component comprises at least 70 wt. % of the copolyester.

In a specific embodiment, the other polymer includes one or more impact modifiers. The thermoplastic copolyester composition can thus optionally comprise the amorphous copolyester and an impact modifier.

For example, the thermoplastic composition can optionally further comprise an impact modifier in an amount from 0.25 to 40 wt. %, or from 0.5 to 25 wt. %, or from 1 to 10 wt. %, based on the total weight of the composition. In other embodiments, the impact modifier is present in an amount from 0.5 to 8 wt. %, specifically from 1.0 to 6 wt. %, still more specifically 0 to 1.0 wt. %, based on the total weight of the composition. In another embodiment, the thermoplastic composition does not include an impact modifier or does not contain appreciable amounts of an impact modifier. In such embodiments, the impact modifier is present in an amount, based on wt. %, ranging from 0 to less than an integer selected from the group consisting of 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 wt. %, and combinations thereof.

Useful impact modifiers include olefin-containing copolymers such as olefin acrylates and olefin diene terpolymers. An example of an olefin acrylate copolymer impact modifier is ethylene ethyl acrylate copolymer available from Union Carbide as DPD-6169. Other higher olefin monomers can be employed as copolymers with alkyl acrylates, for example, propylene and n-butyl acrylate. Olefin diene terpolymers known in the art and generally fall into the EPDM (ethylene propylene diene monomer) family of terpolymers. They are commercially available such as, for example, EPSYN® 704 from Copolymer Rubber Company. Examples of such rubber polymers and copolymers that can be used as impact modifiers are polybutadiene, polyisoprene, and various other polymers or copolymers having a rubbery dienic monomer, for example random copolymers of styrene and butadiene (SBR).

Other thermoplastic impact modifiers are unit copolymers, for example, A-B diblock copolymers and A-B-A triblock copolymers having of one or two alkenyl aromatic units A, which are typically styrene units, and a rubber unit, B, which is typically an isoprene or butadiene unit. The butadiene unit can be partially hydrogenated. Mixtures of these diblock and triblock copolymers are especially useful. Examples of A-B and A-B-A copolymers include polystyrene-polybutadiene, polystyrene-poly(ethylene-propylene), polystyrene-polyisoprene, poly(α-methylstyrene)-polybutadiene, polystyrene-polybutadiene-polystyrene (SBS), polystyrene-poly(ethylene-propylene)-polystyrene, polystyrene-polyisoprene-polystyrene and poly(alpha-methylstyrene)-polybutadiene-poly(alpha-methylstyrene), as well as the selectively hydrogenated versions thereof, and the like. Mixtures of the aforementioned unit copolymers are also useful. Styrene-containing polymers can also be used as impact modifiers.

Other copolymers containing vinyl aromatic compounds, for example styrene, para-methyl styrene, or alpha methyl styrene and vinyl cyanides, for example acrylonitrile or methacrylonitrile, can also be useful as impact modifiers. One example is styrene-acrylonitrile (SAN), comprising 15 to 30 percent by weight acrylonitrile (AN) with the remainder styrene. The SAN can be further modified by grafting to a rubbery substrate such as a 1,4-polybutadiene to produce a rubber graft polymer, e.g., acrylonitrile-butadiene-styrene (ABS), and methacrylonitrile-butadiene-styrene (MBS). High rubber content (greater than about 50 wt %) resins of this type (e.g., HRG-ABS) can be especially useful.

These types of polymers are often available as core-shell polymers. The core usually consists substantially of an acrylate rubber or a butadiene rubber, wherein one or more shells have been grafted on the core. Usually these shells are built up from a vinyl aromatic compound, a vinyl cyanide, an alkyl acrylate or methacrylate, acrylic acid, methacrylic acid, or a combination of the foregoing. The core and/or the shell(s) often comprise multi-functional compounds that can act as a cross-linking agent and/or as a grafting agent. These polymers are usually prepared in several stages. Still other impact modifiers include various elastomeric materials such as organic silicone rubbers, elastomeric fluorohydrocarbons, elastomeric polyesters, random unit polysiloxane-polycarbonate copolymers, and the like.

Specific examples of useful impact modifiers include acrylonitrile-butadiene-styrene, methacrylate-butadiene-styrene, high impact polystyrene, and combinations thereof. With the proviso that desired properties, such as high heat properties, mold shrinkage, tensile elongation, heat deflection temperature, and the like are not adversely affected, the thermoplastic compositions comprising the copolyester can optionally further comprise other known additives used in thermoplastic polyester compositions such as reinforcing fillers, non-reinforcing fillers, stabilizers such as antioxidants, thermal stabilizers, radiation stabilizers, and ultraviolet light absorbing additives, as well as mold release agents, plasticizers, quenchers, lubricants, antistatic agents, dyes, pigments, laser marking additives, and processing aids. A combination comprising one or more of the foregoing or other additives can be used. A specific example of an additive combination is a hindered phenol stabilizer and a waxy mold release agent such as pentaerythritol tetrastearate. When used, the additives are generally present in an amount of 0.01 to 5 wt. %, specifically 0.05 to 2 wt. % each. Alternatively, such additives may be absent from the composition. In one embodiment, such additives are present in an amount ranging from 0 to a number selected from the group consisting of 5, 4, 3, 2, 1, wt. %,

The thermoplastic copolyester compositions can be prepared by blending the components of the composition so that they are homogeneously dispersed in a continuous matrix of the polyester. A number of blending processes can be used. In an exemplary process, the copolyester, other optional polymers, and/or other additives are mixed in an extrusion compounder and extruded to produce molding pellets. In another process, the components, including any reinforcing fibers and/or other additives, are mixed with the copolyester by dry blending, fluxed on a mill and either comminuted or extruded and chopped. The components can also be mixed and directly molded, e.g. by injection or transfer molding. All of the components are dried as much as possible prior to blending. In addition, compounding is carried out with as short a residence time in the machine as possible and at the lowest possible temperature to minimize loss of components by decomposition or volatilization. The temperature is carefully controlled, and friction heat is utilized.

Methods of manufacture of articles include molding, extruding, shaping, injection molding, or calendaring the amorphous copolyester, in particular thermoplastic compositions comprising the amorphous copolyester. In one embodiment, the components are pre-compounded, pelletized, and then molded. Pre-compounding can be carried out in known equipment. For example, after pre-drying the polyester composition (e.g., for four hours at 120° C.), a single screw extruder can be fed with a dry blend of the ingredients, the screw employed having a long transition section to ensure proper melting. Alternatively, a twin-screw extruder with intermeshing co-rotating screws can be fed with polyester and other components at the feed port and reinforcing fibers (and other additives) can optionally be fed downstream. In either case, a generally suitable melt temperature will be 230° C. to 300° C. The pre-compounded components can be extruded and cut up into molding compounds such as granules, pellets, and the like by standard techniques. The granules or pellets can then be molded in any known equipment used for molding thermoplastic compositions, such as a Newbury or van Dorn type injection-molding machine with cylinder temperatures at 230° C. to 280° C., and mold temperatures at 55° C. to 95° C. The granules and pellets can also be extruded into films or sheets. The articles formed by molding or extrusion of the thermoplastic polyester compositions possess an excellent balance of properties.

In particular, the thermoplastic copolyester composition can be molded into useful articles such as heat resistant containers by a variety of means for example, injection molding, blow molding, extruding, and the like. The thermoplastic copolyester composition can also be used to form at least parts in articles such as a wire, an optical fiber, a cable, an automotive part, an outdoor product, a biomedical intermediate or product, a composite material, a melt-spun mono- or multi-filament fiber, an oriented or un-oriented fiber, a hollow, porous or dense component; a woven or non-woven fabric (e.g., a cloth or a felt), a filter, a membrane, a sheet, a film (thin and thick, dense and porous), a multi-layer- and/or multicomponent film, a barrier film, a container, a bag, a bottle, a rod, a liner, a vessel, a pipe, a pump, a valve, an O-ring, an expansion joint, a gasket, a heat exchanger, an injection-molded article, a see-through article, a sealable packaging, a profile, heat-shrinkable film, a thermoplastically welded part, a generally simple and complex part, such as rods, tubes, profiles, linings and internal components for vessels, tanks, columns, pipes, fittings, pumps and valves; an O-ring, a seal, a gasket, a heat exchanger, a hose, an expansion joint, a shrinkable tube; a coating, such as protective coatings, electrostatic coatings, cable and wire coatings, optical fiber coatings; and the like. Articles that can be made from our compositions include and not limited food containers and medical devices, which may be FDA approved. Other articles include houseware articles such as utensils, water bottles, beer bottles, juice containers, soft drink containers, and combinations thereof. Medical articles can include hemodiafilteration housings, medical devices housings for Gamma radiation, e-beam, and ethylene oxide sterilization devices. Infant care articles include baby bottles, pacifier housings, baby food makers, and combinations thereof. Consumer durable articles include and are not limited to chair mats. Small appliance articles can include blending jars, juice maker jars, frozen beverage dispensers, food maker jars, coffee cups, hot drink cups and containers, and sports drink bottles.

In a specific embodiment, a thermoplastic composition comprising the copolyester, or comprising the copolyester and an impact modifier, are formed into a container such as a bottle, having a wall thickness from 1.0 mm 10.0 mm, and an internal volume from 1 to 10,000 mL, from 10 to 5,000 mL, or from 250 to 5,000 mL.

In another specific embodiment, a thermoplastic composition comprises an amorphous copolyester comprising the polymerization reaction product of: (a) a monomer of formula III

wherein R⁴ is each the same and is methyl or ethyl; (b) a virgin monomer selected from dimethyl or diethyl terephthalate, and combinations thereof, and (c) 1,4-cyclohexane dimethanol having an isomer distribution of 60 to 80% trans and 20 to 40% cis isomers; wherein the residue of monomer (a) is present in an amount from 7 to less than 12 mole % of and the residue of monomer (b) is present in an amount from more than 38 to 43 mol %, each based on moles of repeat units in the polyester; and the copolyester has a glass transition temperature of at least 107° C., an intrinsic viscosity of at least 0.7 dl/g, and a molded sample has a Notched Izod value of at least 290 J/m determined in accordance with ASTM D256. This thermoplastic composition can further comprise an additive is selected from reinforcing fillers, non-reinforcing fillers, antioxidants, thermal stabilizers, radiation stabilizers, ultraviolet light absorbing additives, mold release agents, plasticizers, quenchers, lubricants, antistatic agents, dyes, pigments, laser marking additives, processing aids, and combinations thereof, and optionally a polymer selected from polycarbonate, poly(ethylene terephthalate), poly(butylene terephthalate), poly(butylene naphthalate), poly(1,2-propylene terephthalate), poly(cyclohexylene-1,4-dimethylene terephthalate), poly(ethylene terephthalate), poly(1,3-propylene terephthalate), poly(cyclohexylene-1,4-dimethylene cyclohexylene-1,4-dicarboxylate), poly(cyclohexylene-1,4-dimethylene-co-ethylene terephthalate), poly(cyclohexylene-1,4-dimethylene-co-1,3-cyclobutylene terephthalate), and combinations thereof. In another specific embodiment, this thermoplastic composition, optionally comprising an impact modifier, are formed into a container such as a bottle, having a wall thickness from 1.0 mm 10.0 mm, and an internal volume from 1 to 10,000 mL, from 10 to 5,000 mL, or from 250 to 5,000 mL.

EXAMPLES Materials

The materials in Table 1 were used in the Examples.

TABLE 1 Material Description Source DMT Dimethyl terephthalate Fisher Scientific PIDA* 1,3,3-trimethyl-1-phenylindan-4′,5- Amoco dicarboxylic acid CHDM** 1,4-cyclohexane dimethanol Eastman Chemical Co. TPT Titanium tetraisopropoxide DuPont Chemical (Tyzor ™ Catalyst) *Used as received without further purification **30 wt. % cis and 70 wt. % trans configuration

Techniques and Procedures

Molding Procedures

The polymers were injection molded on a BOY molding machine. The pellets were dried for 3 hours at 82° C. in a forced air-circulating oven prior to injection molding. The zone temperature was set to 260° C. The nozzle temperature was also set at 260° C. The mold temperature was 54° C. The screw speed was 100 rpm. The injection, holding, cooling and cycle time were 1.5, 6, 18, and 32 seconds, respectively. All standard parts were 0.125 inches (3.12 mm) thick.

Testing Procedures

Glass transition temperature (Tg) was determined according to ASTM D3418 by Differential Scanning calorimetry (DSC) using Perkin Elmer DSC 7 equipped with Pyris DSC 7 software. In a typical procedure, polymer sample (10-20 mg) was heated from 40° C. to 290° C. (20° C./min), held at 290° C. for 1 min, cooled back to 40° C. (20° C./min), then held at 40° C. for 1 min, and the above heating/cooling cycle was repeated. The second heating cycle is usually used to obtain the Tg data.

Intrinsic viscosity (IV) was determined by automatic Viscotek Microlab® 500 series Relative Viscometer Y501. In a typical procedure, 0.5000 g of polymer sample was fully dissolved in 60/40 mixture (by vol) of % phenol/1,1,2,2-tetrachloroethane solution (Harrell Industries). Two measurements were taken for each sample, and the result reported was the average of the two measurements.

Weight average molecular weight (Mw) and number average molecular weight (Mn) were determined by GPC. A Waters 2695 separation module equipped with a single PL HFIP gel (250×4.6 mm) and a Waters 2487 Dual 2, Absorbance Detector (signals observed at 273 nm) was used for GPC analysis. The mobile phase was a mixture of 5/95% HFIP/Chloroform solution. Typically, samples were prepared by dissolving 50 mg of the polymer pellets in 50 mL of 5/95% HFIP/Chloroform solution. The results were processed using Millennium 32 Chromatography Manager V 4.0. Reported molecular weights are relative to polystyrene standards

Injection molded parts as described were tested in accordance with the ASTM and ISO procedures in Table 2.

Notched Izod testing is done on 3×½×⅛ inch (76.2×12.7×3.2 mm) bars using ASTM method D256. Bars were notched prior to oven aging; samples were tested at room temperature, 25° C.

Examples 1-11

Laboratory synthesis of copolyesters from DMT as shown in Table 3 and further described was conducted in the presence of 250 ppm of titanium (TPT) as the catalyst.

TABLE 3 EI Poly Poly Notched Ex. DMT PIDA (DMT + Temp EI Time Temp Time T_(g) Izod No. (Mol %) (Mol %) PIDA):CHDM (° C.) (Min) (° C.) (Min) (° C.) I.V. (J/m) 1 43 7 1 220 90 270 112 110 0.78 1098 2 43 7 1 220 90 270 78 111 0.7 750 C3 43 7 1 220 90 270 63 107 0.66 110 C4 40 10 1 220 90 275 40 112 0.567 66 C5 40 10 1 220 90 275 44 114 0.62 99.1 6 40 10 1 220 90 275 62 116 0.79 291 C7 40 10 1 220 90 275 50 114 0.69 109 8 40 10 1 220 90 275 97 117 0.87 517 C9 35 15 1 220 90 275 76 121 0.58 69 C10 35 15 1 220 90 275 95 126 0.77 94.1 C11 35 15 1 220 90 275 105 124 0.69 84.3

Example 1

A mixture of 83.42 g (0.43 mol) of DMT, 22.68 g (0.07 mol) of PIDA and 72 g (0.5 mol) of as obtained CHDM were placed into a 500 mL, three neck round bottom flask equipped with a nitrogen inlet, glass stirrer with a metal blade, and a short distillation column. The flask was placed in an oil bath already heated to 180° C. with the stirring speed set at 260 RPM. After 5 minutes, 250 ppm of titanium catalyst was added to the reaction mixture, and the temperature was gradually increased to 220° C. at a rate of 2° C./minute while stirring under nitrogen. The reaction mixture was heated at 220° C. for 23 minutes and then the temperature of reaction was increased to 270° C. After the reaction temperature reached 270° C., pressure inside the reactor was gradually reduced to 0.2 mm Hg (less than 1 torr) over the next 47 minutes. A pressure of less than 1 torr was maintained for a total time of 112 minutes. During this period, the stirring speed was reduced to 60 RPM, then maintained for 20 minutes, and subsequently reduced to 30 RPM for the remainder of polymerization stage. The reaction was stopped and product was collected for analysis. The results for this example are listed in Table 4.

TABLE 4 Example T_(g) Notched No (° C.) M_(n) M_(w) PDI I.V. Izod (J/m) 1 110 25444 71245 2.8 0.778 1098

Discussion

The results indicate that when the copolyester having a repeat unit comprising the reaction product of (a) a 1-phenylindane dicarboxylic acid or ester, in particular PIDA, (b) dialkyl terephthalate and (c) 1,4-cyclohexane dimethanol and wherein the 1-phenylindane dicarboxylic acid or ester, in particular PIDA is present in an amount from 7 to less than 12 mol %, based on the repeat unit of polymer, the polymer exhibited a combination of the following useful properties: (i) the polymer had a Tg of at least 107° C.; and (ii) the polymer had a Notched Izod of at least 290 Joules/m, and (iii) the polymer had an intrinsic viscosity IV of at least 0.7 dl/g.

Example 2

A mixture of 83.42 g (0.43 mol) of DMT, 22.68 g (0.07 mol) of PIDA and 72 g (0.5 mol) of as obtained CHDM were placed into a 500 mL, three neck round bottom flask equipped with a nitrogen inlet, glass stirrer with a metal blade, and a short distillation column. The flask was placed in an oil bath already heated to 180° C. with the stirring speed set at 260 RPM. After 5 minutes, 250 ppm of titanium catalyst was added to the reaction mixture, and the temperature was gradually increased to 220° C. at a rate of 2° C./minute while stirring under nitrogen. The reaction mixture was heated at 220° C. for 23 minutes and then the temperature of reaction was increased to 270° C. After the reaction temperature reached 270° C., pressure inside the reactor was gradually reduced to 0.2 mm Hg (less than 1 torr) over the next 47 minutes. A pressure of less than 1 torr was maintained for a total time of 78 minutes. During this period, the stirring speed was reduced to 60 RPM, was maintained for 20 minutes, and subsequently reduced to 30 RPM for the remainder of polymerization stage. The reaction was stopped and product was collected for analysis. The results for this example are listed in Table 5.

TABLE 5 Example T_(g) Notched No (° C.) M_(n) M_(w) PDI I.V. Izod (J/m) 2 111 23035 67095 2.9 0.71 750

Discussion

The results indicate that when the copolyester having a repeat unit comprising the reaction product of (a) a 1-phenylindane dicarboxylic acid or ester, in particular PIDA, (b) dialkyl terephthalate and (c) 1,4-cyclohexane dimethanol and wherein the 1-phenylindane dicarboxylic acid or ester, in particular PIDA is present in an amount from 7 to less 12 mol %, based on the repeat unit of polymer, the polymer exhibited a combination of the following useful properties: (i) the polymer had a Tg of at least 107° C.; and (ii) the polymer had a Notched Izod of at least 290 Joules/m, and (iii) the polymer had an intrinsic viscosity IV of at least 0.7 dl/g.

Comparative Example 3

A mixture of 83.42 g (0.43 mol) of DMT, 22.68 g (0.07 mol) of PIDA and 72 g (0.5 mol) of as obtained CHDM were placed into a 500 mL, three neck round bottom flask equipped with a nitrogen inlet, glass stirrer with a metal blade, and a short distillation column. The flask was placed in an oil bath already heated to 180° C. with the stirring speed set at 260 RPM. After 5 minutes, 250 ppm of titanium catalyst was added to the reaction mixture, and the temperature was gradually increased to 220° C. at a rate of 2° C./minute while stirring under nitrogen. The reaction mixture was heated at 220° C. for 23 minutes and then the temperature of reaction was increased to 270° C. After the reaction temperature reached 270° C., pressure inside the reactor was gradually reduced to 0.2 mm Hg (less than 1 torr) over the next 47 minutes. A pressure of less than 1 torr was maintained for a total time of 63 minutes. During this period, the stirring speed was reduced to 60 RPM, was maintained for 20 minutes, and subsequently reduced to 30 RPM for the remainder of polymerization stage. The reaction was stopped and product was collected for analysis. The results for this example are listed in Table 6.

TABLE 6 Example T_(g) Notched No (° C.) M_(n) M_(w) PDI I.V. Izod (J/m) C3 107 20740 57923 2.8 0.659 110

Discussion

The results indicate that when the copolyester having a repeat unit comprising the reaction product of (a) a 1-phenylindane dicarboxylic acid or ester, in particular PIDA, (b) a dialkyl terephthalate and (c) 1,4-cyclohexane dimethanol and wherein the 1-phenylindane dicarboxylic acid or ester, in particular PIDA is present in an amount from 7 to less 12 mol %, based on the repeat unit of polymer, the polymer did not exhibit a combination of the following useful properties: (i) the polymer had Tg of at least 107° C.; and (ii) the polymer did not have a Notched Izod of at least 290 Joules/m, and (iii) the polymer did not have an intrinsic viscosity IV of at least 0.7 dl/g.

Comparative Example 4

A mixture of 77.6 g (0.4 mol) of DMT, 32.4 g (0.1 mol) of PIDA and 72 g (0.5 mol) of as obtained CHDM were placed into a 500 mL, three neck round bottom flask equipped with a nitrogen inlet, glass stirrer with a metal blade, and a short distillation column. The flask was placed in an oil bath already heated to 180° C. with the stirring speed set at 260 RPM. After 5 minutes, 250 ppm of titanium catalyst was added to the reaction mixture, and the temperature was gradually increased to 220° C. at a rate of 2° C./minute while stirring under nitrogen. The reaction mixture was heated at 220° C. for 23 minutes and then the temperature of reaction was increased to 275° C. After the reaction temperature reached 275° C., pressure inside the reactor was gradually reduced to 0.2 mm Hg (less than 1 torr) over the next 15 minutes. A pressure of less than 1 torr was maintained for a total time of 40 minutes. During this period, the stirring speed was reduced to 60 RPM, was maintained for 20 minutes was subsequently reduced to 30 RPM for the remainder of polymerization stage. The reaction was stopped and product was collected for analysis. The results for this example are shown in Table 7.

TABLE 7 Example T_(g) Notched No (° C.) M_(n) M_(w) PDI I.V. Izod (J/m) C4 112 18035 48217 2.7 0.566 66

Discussion

The results indicate that when the copolyester having a repeat unit comprising the reaction product of (a) a 1-phenylindane dicarboxylic acid or ester, in particular PIDA, (b) dialkyl terephthalate and (c) cyclohexane dimethanol and the 1-phenylindane dicarboxylic acid or ester, in particular PIDA is present in an amount from 7 to less 12 mol %, based on the repeat unit of polymer, the polymer did not exhibit a combination of the following useful properties: (i) the polymer had Tg of at least 107° C.; and (ii) the polymer did not have a Notched Izod of at least 290 Joules/m, and (iii) the polymer did not have an intrinsic viscosity IV of at least 0.7 dl/g.

Comparative Example 5

A mixture of 77.6 g (0.4 mol) of DMT, 32.4 g (0.1 mol) of PIDA and 72 g (0.5 mol) of as obtained CHDM were placed into a 500 mL, three neck round bottom flask equipped with a nitrogen inlet, glass stirrer with a metal blade, and a short distillation column. The flask was placed in an oil bath already heated to 180° C. with the stirring speed set at 260 RPM. After 5 minutes, 250 ppm of titanium catalyst was added to the reaction mixture, and the temperature was gradually increased to 220° C. at a rate of 2° C./minute while stirring under nitrogen. The reaction mixture was heated at 220° C. for 23 minutes and then the temperature of reaction was increased to 275° C. After the reaction temperature reached 275° C., pressure inside the reactor was gradually reduced to 0.2 mm Hg (less than 1 torr) over the next 15 minutes. A pressure of less than 1 torr was maintained for a total time of 44 minutes. During this period, the stirring speed was reduced to 60 RPM, was maintained for 20 minutes was subsequently reduced to 30 RPM for the remainder of polymerization stage. The reaction was stopped and product was collected for analysis. The results for this example are shown in Table 8.

TABLE 8 Example T_(g) Notched No (° C.) M_(n) M_(w) PDI I.V. Izod (J/m) C5 114 25308 78656 0.623 0.623 99.1

Discussion

The results indicate that when the copolyester having a repeat unit comprising the reaction product of (a) a 1-phenylindane dicarboxylic acid or ester, in particular PIDA, (b) dialkyl terephthalate and (c) cyclohexane dimethanol and the 1-phenylindane dicarboxylic acid or ester, in particular PIDA is present in an amount from 7 to less 12 mol %, based on the repeat unit of polymer, the polymer did not exhibit a combination of the following useful properties: (i) the polymer had a Tg of at least 107° C.; and (ii) the polymer did not have a Notched Izod of at least 290 Joules/m, and (iii) the polymer did not have an intrinsic viscosity IV of at least 0.7 dl/g.

Example 6

A mixture of 77.6 g (0.4 mol) of DMT, 32.4 g (0.1 mol) of PIDA and 72 g (0.5 mol) of as obtained CHDM were placed into a 500 mL, three neck round bottom flask equipped with a nitrogen inlet, glass stirrer with a metal blade, and a short distillation column. The flask was placed in an oil bath already heated to 180° C. with the stirring speed set at 260 RPM. After 5 minutes, 250 ppm of titanium catalyst was added to the reaction mixture, and the temperature was gradually increased to 220° C. at a rate of 2° C./minute while stirring under nitrogen. The reaction mixture was heated at 220° C. for 23 minutes and then the temperature of reaction was increased to 275° C. After the reaction temperature reached 275° C., pressure inside the reactor was gradually reduced to 0.2 mm Hg (less than 1 torr) over the next 15 minutes. A pressure of less than 1 torr was maintained for a total time of 62 minutes. During this period, the stirring speed was reduced to 60 RPM, was maintained for 20 minutes was subsequently reduced to 30 RPM for the remainder of polymerization stage. The reaction was stopped and product was collected for analysis. The results for this example are shown in Table 9.

TABLE 9 Example T_(g) Notched No (° C.) M_(n) M_(w) PDI I.V. Izod (J/m) 6 116 25308 78656 3.1 0.789 291

Discussion

The results indicate that when the copolyester having a repeat unit comprising the reaction product of (a) a 1-phenylindane dicarboxylic acid or ester, in particular PIDA, (b) dialkyl terephthalate and (c) cyclohexane dimethanol and the 1-phenylindane dicarboxylic acid or ester, in particular PIDA is present in an amount from 7 to less 12 mol %, based on the repeat unit of polymer, the polymer exhibited a combination of the following useful properties: (i) the polymer had Tg of at least 107° C.; and (ii) the polymer had a Notched Izod of at least 290 Joules/m, and (iii) the polymer had an intrinsic viscosity IV of at least 0.7 dl/g.

Comparative Example 7

A mixture of 77.6 g (0.4 mol) of DMT, 32.4 g (0.1 mol) of PIDA and 72 g (0.5 mol) of as obtained CHDM were placed into a 500 mL, three neck round bottom flask equipped with a nitrogen inlet, glass stirrer with a metal blade, and a short distillation column. The flask was placed in an oil bath already heated to 180° C. with the stirring speed set at 260 RPM. After 5 minutes, 250 ppm of titanium catalyst was added to the reaction mixture, and the temperature was gradually increased to 220° C. at a rate of 2° C./minute while stirring under nitrogen. The reaction mixture was heated at 220° C. for 23 minutes and then the temperature of reaction was increased to 275° C. After the reaction temperature reached 275° C., pressure inside the reactor was gradually reduced to 0.2 mm Hg (less than 1 torr) over the next 15 minutes. A pressure of less than 1 torr was maintained for a total time of 50 minutes. During this period, the stirring speed was reduced to 60 RPM, was maintained for 20 minutes was subsequently reduced to 30 RPM for the remainder of polymerization stage. The reaction was stopped and product was collected for analysis. The results for this example are shown in Table 10.

TABLE 10 Example T_(g) Notched No (° C.) M_(n) M_(w) PDI I.V. Izod (J/m) C7 114 21813 61522 2.8 0.691 109

Discussion

The results indicate that when the copolyester having a repeat unit comprising the reaction product of (a) a 1-phenylindane dicarboxylic acid or ester, in particular PIDA, (b) dialkyl terephthalate and (c) cyclohexane dimethanol and the 1-phenylindane dicarboxylic acid or ester, in particular PIDA is present in an amount from 7 to less 12 mol %, based on the repeat unit of polymer, the polymer did not exhibit a combination of the following useful properties: (i) the polymer had a Tg of at least 107° C.; and (ii) the polymer did not have a Notched Izod of at least 290 Joules/m, and (iii) the polymer did not have an intrinsic viscosity IV of at least 0.7 dl/g.

Example 8

A mixture of 77.6 g (0.4 mol) of DMT, 32.4 g (0.1 mol) of PIDA and 72 g (0.5 mol) of as obtained CHDM were placed into a 500 mL, three neck round bottom flask equipped with a nitrogen inlet, glass stirrer with a metal blade, and a short distillation column. The flask was placed in an oil bath already heated to 180° C. with the stirring speed set at 260 RPM. After five minutes, 250 ppm of titanium catalyst was added to the reaction mixture, and the temperature was gradually increased to 220° C. at a rate of 2° C./minute while stirring under nitrogen. The reaction mixture was heated at 220° C. for 23 minutes and then the temperature of reaction was increased to 275° C. After the reaction temperature reached 275° C., pressure inside the reactor was gradually reduced to 0.2 mm Hg (less than 1 torr) over the next 15 minutes. A pressure of less than 1 torr was maintained for a total time of 97 minutes. During this period, the stirring speed was reduced to 60 RPM, was maintained for 20 minutes was subsequently reduced to 30 RPM for the remainder of polymerization stage. The reaction was stopped and product was collected for analysis. The results for this example are shown in Table 11.

TABLE 11 Example T_(g) Notched No (° C.) M_(n) M_(w) PDI I.V. Izod (J/m) 8 117.3 26975 80967 3.0 0.868 517

Discussion

The results indicate that when the copolyester having a repeat unit comprising the reaction product of (a) a 1-phenylindane dicarboxylic acid or ester, in particular PIDA, (b) dialkyl terephthalate and (c) cyclohexane dimethanol and the a 1-phenylindane dicarboxylic acid or ester, in particular PIDA is present in an amount from 7 to less 12 mol %, based on the repeat unit of polymer, the polymer exhibited a combination of the following useful properties: (i) the polymer had Tg of at least 107° C.; and (ii) the polymer had a Notched Izod of at least 290 Joules/m, and (iii) the polymer had an intrinsic viscosity IV of at least 0.7 dl/g.

Comparative Example 9

A mixture of 67.9 g (0.35 mol) of DMT, 48.6 g (0.15 mol) of PIDA and 72 g (0.5 mol) of as obtained CHDM were placed into a 500 mL, three neck round bottom flask equipped with a nitrogen inlet, glass stirrer with a metal blade, and a short distillation column. The flask was placed in an oil bath already heated to 180° C. with the stirring speed set at 260 RPM. After 5 minutes, 250 ppm of titanium catalyst was added to the reaction mixture, and the temperature was gradually increased to 220° C. at a rate of 2° C./minute while stirring under nitrogen. The reaction mixture was heated at 220° C. for 23 minutes and then the temperature of reaction was increased to 275° C. After the reaction temperature reached 275° C., pressure inside the reactor was gradually reduced to 0.2 mm Hg (less than 1 torr) over the next 15 minutes. A pressure of less than 1 torr was maintained for a total time of 76 minutes. During this period, the stirring speed was reduced to 60 RPM, was maintained for 20 min was subsequently reduced to 30 RPM for the remainder of polymerization stage. The reaction was stopped and product was collected for analysis. The results for this example are shown in Table 12.

TABLE 12 Example T_(g) Notched No (° C.) M_(n) M_(w) PDI I.V. Izod (J/m) C9 120.6 22499 58108 2.6 0.580 69

Discussion

The results indicate that when the copolyester having a repeat unit comprising the reaction product of (a) a 1-phenylindane dicarboxylic acid or ester, in particular PIDA, (b) dialkyl terephthalate and (c) cyclohexane dimethanol and the 1-phenylindane dicarboxylic acid or ester, in particular PIDA is present in an amount more than 12 mol %, based on the repeat unit of polymer, the polymer did not exhibit a combination of the following useful properties: (i) the polymer had Tg of at least 107° C.; and (ii) the polymer did not have a Notched Izod of at least 290 Joules/m, and (iii) the polymer did not have an intrinsic viscosity IV of at least 0.7 dl/g.

Comparative Example 10

A mixture of 67.9 g (0.35 mol) of DMT, 48.6 g (0.15 mol) of PIDA and 72 g (0.5 mol) of as obtained CHDM were placed into a 500 mL, three neck round bottom flask equipped with a nitrogen inlet, glass stirrer with a metal blade, and a short distillation column. The flask was placed in an oil bath already heated to 180° C. with the stirring speed set at 260 RPM. After 5 minutes, 250 ppm of titanium catalyst was added to the reaction mixture, and the temperature was gradually increased to 220° C. at a rate of 2° C./minute while stirring under nitrogen. The reaction mixture was heated at 220° C. for 23 minutes and then the temperature of reaction was increased to 275° C. After the reaction temperature reached 275° C., pressure inside the reactor was gradually reduced to 0.2 mm Hg (less than 1 torr) over the next 15 minutes. A pressure of less than 1 torr was maintained for a total time of 95 minutes. During this period, the stirring speed was reduced to 60 RPM, was maintained for 20 minutes was subsequently reduced to 30 RPM for the remainder of polymerization stage. The reaction was stopped and product was collected for analysis. The results for this example are shown in Table 13.

TABLE 13 Example T_(g) Notched No (° C.) M_(n) M_(w) PDI I.V. Izod (J/m) C10 126 30151 89923 3.0 0.776 94.1

Discussion

The results indicate that when the copolyester having a repeat unit comprising the reaction product of (a) a 1-phenylindane dicarboxylic acid or ester, in particular PIDA, (b) dialkyl terephthalate and (c) cyclohexane dimethanol and the a 1-phenylindane dicarboxylic acid or ester, in particular PIDA is present in an amount more than 12 mol %, based on the repeat unit of polymer, the polymer did not exhibit a combination of the following useful properties: (i) the polymer had a Tg of at least 107° C.; and (ii) the polymer did not have a Notched Izod of at least 290 Joules/m, and (iii) the polymer did not have an intrinsic viscosity IV of at least 0.7 dl/g.

Comparative Example 11

A mixture of 67.9 g (0.35 mol) of DMT, 48.6 g (0.15 mol) of PIDA and 72 g (0.5 mol) of as obtained CHDM were placed into a 500 mL, three neck round bottom flask equipped with a nitrogen inlet, glass stirrer with a metal blade, and a short distillation column. The flask was placed in an oil bath already heated to 180° C. with the stirring speed set at 260 RPM. After five minutes, 250 ppm of titanium catalyst was added to the reaction mixture, and the temperature was gradually increased to 220° C. at a rate of 2° C./minute while stirring under nitrogen. The reaction mixture was heated at 220° C. for 23 minutes and then the temperature of reaction was increased to 275° C. After the reaction temperature reached 275° C., pressure inside the reactor was gradually reduced to 0.2 mm Hg (less than 1 torr) over the next 15 minutes. A pressure of less than 1 torr was maintained for a total time of 105 minutes. During this period, the stirring speed was reduced to 60 RPM, was maintained for 20 minutes was subsequently reduced to 30 RPM for the remainder of polymerization stage. The reaction was stopped and product was collected for analysis. The results for this example are shown in Table 14.

TABLE 14 Example T_(g) Notched No (° C.) M_(n) M_(w) PDI I.V. Izod (J/m) C11 124 26248 73791 2.8 0.691 84.3

Discussion

The results indicate that when the copolyester having a repeat unit comprising the reaction product of (a) a 1-phenylindane dicarboxylic acid or ester, in particular PIDA, (b) dialkyl terephthalate and (c) cyclohexane dimethanol and the 1-phenylindane dicarboxylic acid or ester, in particular PIDA is present in an amount more than 12 mol % based on the repeat unit of polymer, the polymer did not exhibit a combination of the following useful properties: (i) the polymer had a Tg of at least 107° C.; and (ii) the polymer did not have a Notched Izod of at least 290 Joules/m, and (iii) the polymer did not have an intrinsic viscosity IV of at least 0.7 dl/g.

Table 15 shows the results of a compositional analysis of terephthalate, PIDA, and CHDM units in the Examples as determined by proton nuclear magnetic spectroscopy.

TABLE 15 Compositional Analysis by ¹H NMR Example No. Terephthalate PIDA CHDM 1 41.68 7.30 51.02 2 42.14 7.26 50.33 C3 41.90 7.60 50.51 C4 39.53 10.37 50.10 C5 38.78 10.46 50.77 6 38.98 10.46 50.56 C7 38.91 10.30 50.79 8 38.98 10.25 50.77 C9 34.05 15.48 50.45 C10 33.97 15.08 50.95 C11 33.91 15.19 50.89

All cited patents, patent applications, and other references are incorporated herein by reference in their entirety.

Although the present invention has been described in detail with reference to certain preferred versions thereof, other variations are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the versions contained therein. 

What is claimed is:
 1. A method of manufacture of an amorphous copolyester consisting essentially of polymerizing, in the presence of an esterification catalyst: (c) a monomer of formula I

wherein R¹, R², R³, and R⁵ are each independently a C₁₋₃ alkyl group, a is 0-1, b is 0-4, c is 0-4, and d is 0-3, and each R⁴ is independently hydrogen or a C₁₋₃ alkyl group; (b) more than 38 to 43 mol % of a virgin monomer selected from terephthalic acid, a di(C₁₋₃ alkyl) terephthalate, and combinations thereof, and (c) about 50 mol % of 1,4-cyclohexane dimethanol; wherein the residue of monomer (a) is present in an amount from 7 to less than 12 mole % of the copolyester based on moles of repeat units in the polyester; and wherein the copolyester has a glass transition temperature of at least 107° C., an intrinsic viscosity of at least 0.7 dl/g, and a molded sample has a Notched Izod value of at least 290 J/m determined in accordance with ASTM D256 wherein the method further comprises heating the components to a temperature within the range of 220° C. to 270° C. during polymerization. 